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Frontiers of Information Technology & Electronic Engineering
ISSN 2095-9184 (print), ISSN 2095-9230 (online)
2021 Vol.22 No.9 P.1270-1276
Electrically tunable liquid crystal coplanar waveguide stepped-impedance resonator
Abstract: A tunable stepped-impedance resonator using liquid crystal is demonstrated. Two resonant frequencies at 3.367 and 7.198 GHz are realized and can be continuously tuned by external applied voltages. Continuous tunable ranges of 52 and 210 MHz have been achieved at a particularly low driving voltage of 14 V, which shows good agreement with the simulation results. The voltage-induced hysteresis phenomenon is also investigated. This device also has a low insertion loss of −2.9 and −4 dB for the two resonant frequencies and the return losses are less than −21.5 dB. This work provides a new protocol to realize a tunable frequency for communication systems.
Key words: Tunable stepped-impedance resonator (SIR), Liquid crystal, Coplanar waveguide (CPW)
1南京邮电大学电子与光学工程学院、微电子学院，中国南京市，210023
2南京邮电大学射频集成与微组装国家地方联合工程实验室，中国南京市，210023
摘要：提出一种液晶可调阶梯阻抗谐振器。该谐振器分别在3.367 GHz和7.198 GHz处谐振，这两个频点可通过对液晶层加载电压实现连续调节。实验表明仅需施加14 V的外加电压，即可实现52 MHz和210 MHz的调谐范围，并与仿真结果吻合；在此基础上，研究了驱动过程中电压带来的迟滞效应。该器件在两个频点处的插入损耗分别为−2.9 dB和−4 dB，回波损耗均小于−21.5 dB。该谐振器可应用于需要频率连续可调的各类通信系统中。
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DOI:
10.1631/FITEE.2000278
CLC number:
TN99
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On-line Access:
2024-08-27
Received:
2023-10-17
Revision Accepted:
2024-05-08
Crosschecked:
2021-08-24